Francis Delagardie was the son of Paul H. Delagardie and Marguerite Blakeney, and through them a Wold Newton Family member. He was twice married; firstly, to Enid Austin by whom he had a son Paul Austin Delagardie; secondly, to Lucasta Rutherford, mother to his daughters Enid, Honoria Lucasta, and Rhoda.
Francis and his family are described by Philip José Farmer in Tarzan Alive.